Rules ignoring input item

Setup, Configuration and Use Scripts & Rules
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1

Hi sorry for my bad english.
Simple program for door sensor with mqtt broker and notification with openhab cloud.

Item file

// Items file
//Security items
Switch SecuritySystem "SecuritySystem"
Contact DoorSensor "Door Sensor [%s]" <door> {mqtt="<[broker:Home/Security/Sensor1:state:default]"}

Mqtt it workin i view change open/closed.

Rules file

//rules file
rule "Door sensor"
  when
    item DoorSensor received update OPEN
  then
    if(SecuritySystem.state == ON)
    {
      SendBroadcastNotification("Door is opening!")
    }

in log file i have warn

[WARN ]  [el.core.internal.ModelRepositoryImpl] - Configuration model 'xxxx.rules' has error, therefore ignoring it : [4,3]: no viable alternative at input 'item'

Where I’m wrong, syntax or something else. Please help

2

Capital “I” for “Item”

when
    Item DoorSensor received update OPEN
then
3

I’ve been trying for two weeks to get him to work. Thank you very much

4

Thanks, same for me “Capital I”

This is stupid logic isn´t it

5

Almost all programming languages, the Rules DSL included, are case sensitive. Languages and computer interfaces where case doesn’t matter are the exception.